CN111980995B - Hydraulic system and vehicle - Google Patents

Hydraulic system and vehicle Download PDF

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Publication number
CN111980995B
CN111980995B CN202010737999.3A CN202010737999A CN111980995B CN 111980995 B CN111980995 B CN 111980995B CN 202010737999 A CN202010737999 A CN 202010737999A CN 111980995 B CN111980995 B CN 111980995B
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China
Prior art keywords
oil
hydraulic system
valve
way
oil passage
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CN202010737999.3A
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Chinese (zh)
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CN111980995A (en
Inventor
魏立梅
石刚
戴振坤
吴潇潇
刘桂武
梁存飞
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Qinzhou Green Pass Technology Co ltd
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Qinzhou Green Pass Technology Co ltd
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Priority to CN202010737999.3A priority Critical patent/CN111980995B/en
Publication of CN111980995A publication Critical patent/CN111980995A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
    • F15B21/08—Servomotor systems incorporating electrically operated control means
    • F15B21/087—Control strategy, e.g. with block diagram
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R17/00—Arrangements or adaptations of lubricating systems or devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
    • F15B11/17—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors using two or more pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B13/00—Details of servomotor systems ; Valves for servomotor systems
    • F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
    • F15B13/06—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with two or more servomotors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
    • F15B21/04—Special measures taken in connection with the properties of the fluid
    • F15B21/041—Removal or measurement of solid or liquid contamination, e.g. filtering
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
    • F15B21/04—Special measures taken in connection with the properties of the fluid
    • F15B21/042—Controlling the temperature of the fluid
    • F15B21/0423—Cooling
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H57/00—General details of gearing
    • F16H57/04—Features relating to lubrication or cooling or heating
    • F16H57/0402—Cleaning of lubricants, e.g. filters or magnets
    • F16H57/0404—Lubricant filters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H57/00—General details of gearing
    • F16H57/04—Features relating to lubrication or cooling or heating
    • F16H57/0412—Cooling or heating; Control of temperature
    • F16H57/0413—Controlled cooling or heating of lubricant; Temperature control therefor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H57/00—General details of gearing
    • F16H57/04—Features relating to lubrication or cooling or heating
    • F16H57/0434—Features relating to lubrication or cooling or heating relating to lubrication supply, e.g. pumps ; Pressure control
    • F16H57/0435—Pressure control for supplying lubricant; Circuits or valves therefor

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Control Of Transmission Device (AREA)
  • General Details Of Gearings (AREA)

Abstract

The invention relates to a hydraulic system and a vehicle, the hydraulic system comprises: a fuel tank in which oil is stored; an electric pump capable of pumping oil out of the oil tank; a hydraulic control system having a pressure maintaining valve; an element to be lubricated to which oil can be delivered through the first oil passage; the pressure stabilizing device is arranged in the second oil way, the first oil way and the second oil way are arranged in parallel, and the pressure of the pressure stabilizing device is smaller than that of the surge damping valve. The invention realizes that proper lubricating oil can be provided by the electric pump when the vehicle starts by arranging a new oil path after the oil outlet of the electric pump and arranging the pressure stabilizing device with pressure lower than that of the pressure stabilizing valve in the oil path.

Description

Hydraulic system and vehicle
Technical Field
The invention belongs to the technical field of hydraulic pressure, and particularly relates to a hydraulic system and a vehicle comprising the same.
Background
Hydraulic systems have found wide application in vehicles. For example, on a vehicle, a hydraulic system may provide hydraulic pressure and lubrication to various hydraulic control components, such as to provide a desired brake pressure to a brake system, to provide a desired pressure for engagement of elements such as clutches in a transmission, to provide lubrication to various components, and so forth.
Fig. 1 shows a hydraulic system. The hydraulic system comprises a tank and a mechanical and electric pump capable of pumping hydraulic oil from the tank, after which the hydraulic oil is delivered to a number of components, such as the clutch C, the motor M, the bearing B, etc., through the surge tank valves of the hydraulic control system. An oil cooler may also be disposed between the hydraulic control system and the plurality of components.
In the hydraulic system shown in fig. 1, there are the following disadvantages:
a. the lubrication ratio of each lubrication point of the motor, the clutch, the bearing and the like is fixed, and the lubrication amount required by each component is different, so that the system cannot adjust the lubrication amount of each component according to the requirement;
b. when starting, only an electric pump is used for supplying oil, and under the conditions that the main oil pressure requirement is small and the lubricating flow requirement is high, a pressure stabilizing valve in the hydraulic control system is not opened, so that sufficient lubricating flow cannot be supplied to the lubricating system.
It should be noted that the above-mentioned technical solutions given in the background may not be prior art in the patent law sense, but only known by the inventor of the present invention. The above-described arrangements are merely provided to more particularly describe the improvements of the present invention and are not indicative of the prior art which the applicant has recognized in the sense of patent law.
Disclosure of Invention
Therefore, the invention provides the following technical scheme:
a hydraulic system, comprising:
a tank in which oil is stored;
an electric pump capable of pumping oil out of the oil tank;
a hydraulic control system having a pressure maintaining valve;
an element to be lubricated to which oil can be delivered through the first oil passage;
the pressure stabilizing device is arranged in the second oil way, the first oil way and the second oil way are arranged in parallel, and the pressure of the pressure stabilizing device is smaller than that of the pressure stabilizing valve.
As a development of the invention, a mechanical pump is also provided, which is arranged in parallel with the electric pump.
As a refinement of the invention, a third oil passage is provided after the second oil passage, and an on-off valve is provided in the third oil passage.
As an improvement of the invention, a plurality of the elements to be lubricated are respectively arranged in different oil passages.
As a modification of the invention, the fourth oil passage is connected to both the third oil passage and the first oil passage, and is divided into a fifth oil passage and a sixth oil passage after the fourth oil passage, and a first on-off proportional valve is provided in the fifth oil passage.
As a modification of the invention, the fifth oil passage is divided into a seventh oil passage and an eighth oil passage, and a second on-off proportional valve is provided in the seventh oil passage.
As a refinement of the invention, the sixth oil passage is used for lubricating a bearing.
As a refinement of the invention, the seventh oil passage is used for lubricating the electric machine and/or the eighth oil passage is used for lubricating the clutch.
As an improvement of the invention, the pressure stabilizing device is an electromagnetic pressure stabilizing valve.
The invention also provides a vehicle comprising such a hydraulic system and a method of operating such a vehicle, when the vehicle is taking off, at the very beginning of the vehicle take off, the second oil circuit being switched on so that the electric pump can pump oil through the second oil circuit to the element to be lubricated; when the vehicle is running normally, the second oil passage is disconnected, and oil is pumped to the element to be lubricated through the first oil passage.
According to the technical scheme, the novel oil path is separately arranged behind the oil outlet of the electric pump, and the pressure stabilizing device with the pressure lower than that of the pressure stabilizing valve is arranged in the oil path, so that the electric pump can provide proper lubricating oil when the vehicle starts.
Other advantages of the present invention will be more readily understood after reading the detailed description of the technical solutions of the present invention taken in conjunction with the accompanying drawings.
Drawings
FIG. 1 shows a schematic diagram of a hydraulic system known to the inventors;
fig. 2 shows a schematic diagram of the hydraulic system of the present invention.
Detailed Description
Embodiments of the present invention are described below with reference to the drawings.
Referring to fig. 2, the hydraulic system includes: an oil tank in which oil that can be hydraulic oil and lubricating oil is stored; a mechanical pump 1 capable of drawing oil from a tank and pumping it out; an electric pump 2 capable of drawing oil from the tank and pumping it out; filters may also be provided between the mechanical and electric pumps 1, 2 and the tank to filter the oil. The mechanical pump and the electric pump are arranged in parallel, and can work independently or cooperatively; the oil paths of the mechanical pump and the oil pump are merged before the hydraulic control system. A one-way valve is arranged between the mechanical pump 1 and the hydraulic control system, and a one-way valve is also arranged between the electric pump 2 and the hydraulic control system. In addition, a check valve is arranged between the oil tank and the check valve in parallel with the mechanical pump.
After the hydraulic control system, there is a first oil passage L1, the first oil passage L1 is connected to a fourth oil passage L4, and an oil cooler 5 is provided in the fourth oil passage L4. In addition, unlike the hydraulic system in fig. 1, the present invention has a second oil passage L2 provided in the oil passage where the electric pump 2 is separately provided, after the oil outlet of the electric pump, a pressure stabilizer 3 preferably using an electrically controlled pressure stabilizing valve, preferably having a pressure ranging from 0 to 12bar, is provided in the second oil passage L2, and then the second oil passage L2 is connected to a third oil passage L3, and an on-off valve 4 is provided in the third oil passage L3. Subsequently, the third oil passage L3 is also connected to the fourth oil passage L4.
After the oil cooler 5, the oil passages are divided into a fifth oil passage L5 and a sixth oil passage L6, a first on-off proportional valve 6 is provided in the fifth oil passage L5, and the sixth oil passage L6 leads to a bearing 7 for lubricating the bearing 7. Further, after the first on-off proportional valve 6 of the fifth oil path L5, the oil path is divided into two paths, i.e., a seventh oil path L7 and an eighth oil path L8. The eighth oil passage L8 leads to the clutch 9, and in the seventh oil passage L7, a second on-off proportional valve 10 is provided, which is then connected to the motor 8.
In the present invention, the pressure of the surge valve in the second oil passage L2 is set to be smaller than the pressure of the surge valve in the hydraulic control system. Therefore, when the switch valve in the third oil path is opened, the pressure of the pressure maintaining valve in the second oil path L2 is set to be smaller than that of the pressure maintaining valve in the hydraulic control system, and at the moment, the electric pump provides hydraulic oil for each subsequent oil path through the pressure maintaining valve in the second oil path L2 and the switch valve in the third oil path L3; when the mechanical pump and the electric pump work together, the switch valve in the third oil path L3 is closed, and the oil discharged by the electric pump flows through the pressure stabilizing valve in the hydraulic control system and then is supplied for lubrication through the first oil path L1 and the fourth oil path L4.
The hydraulic system of the present invention may operate as follows: when the vehicle starts, the switch valve is opened, the main oil pressure requirement can be controlled by the electric control pressure stabilizing valve according to the torque, and the lubricating flow can be provided as much as possible when the electric pump works independently;
when the vehicle normally runs, the switch valve is closed, the two pumps work simultaneously, and oil reaches the lubricating oil way after passing through the front section pressure stabilizing valve, so that lubrication is realized.
In addition, the switch proportional valve is additionally arranged in an oil way where the motor and the clutch are located, so that the lubricating flow of the motor and the clutch is adjusted, and the lubricating efficiency is improved.
Various embodiments of the present invention have been described in detail above. Those skilled in the art can make numerous possible variations and modifications to the described embodiments, or modify equivalent embodiments, without departing from the scope of the invention. Therefore, any modification, equivalent change and modification made to the above embodiments according to the technology of the present invention are within the protection scope of the present invention, unless the content of the technical solution of the present invention is departed from.

Claims (10)

1. A hydraulic system, comprising:
a fuel tank in which oil is stored;
an electric pump capable of pumping oil out of the oil tank;
a hydraulic control system having a pressure maintaining valve;
a check valve disposed between the electric pump and the hydraulic control system;
an element to be lubricated to which oil can be delivered through the first oil passage;
it is characterized in that the preparation method is characterized in that,
the hydraulic system further comprises a second oil path, one end of the second oil path is arranged between an oil outlet of the electric pump and the one-way valve, a pressure stabilizing device is arranged in the second oil path, the first oil path and the second oil path are arranged in parallel, and the pressure of the pressure stabilizing device is smaller than that of the pressure stabilizing valve, so that proper lubricating oil can be provided by the electric pump when the vehicle starts.
2. A hydraulic system according to claim 1, wherein:
the device is also provided with a mechanical pump, and the mechanical pump and the electric pump are arranged in parallel.
3. A hydraulic system according to claim 1, wherein:
a third oil passage is provided after the second oil passage, and an on-off valve is provided in the third oil passage.
4. A hydraulic system as claimed in any one of claims 1 to 3, characterized in that:
the elements to be lubricated are respectively positioned in different oil passages.
5. A hydraulic system according to claim 4, wherein:
the hydraulic system further comprises a fourth oil way, the fourth oil way is simultaneously connected with the third oil way and the first oil way, the fourth oil way is divided into a fifth oil way and a sixth oil way, and a first switch proportional valve is arranged in the fifth oil way.
6. A hydraulic system according to claim 5, wherein:
the fifth oil passage is divided into a seventh oil passage in which a second on-off proportional valve is provided, and an eighth oil passage.
7. A hydraulic system according to claim 5, wherein:
and the sixth oil path is used for lubricating the bearing.
8. A hydraulic system according to claim 6, wherein:
the seventh oil path is used for lubricating the motor, and the eighth oil path is used for lubricating the clutch.
9. A vehicle, characterized by comprising a hydraulic system according to any one of claims 1-8.
10. A method for operating a vehicle according to claim 9,
when the vehicle starts, the second oil way is switched on when the vehicle starts, so that the electric pump can pump oil to the element to be lubricated through the second oil way;
when the vehicle is running normally, the second oil passage is disconnected, and oil is pumped to the element to be lubricated through the first oil passage.
CN202010737999.3A 2020-07-28 2020-07-28 Hydraulic system and vehicle Active CN111980995B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202010737999.3A CN111980995B (en) 2020-07-28 2020-07-28 Hydraulic system and vehicle

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202010737999.3A CN111980995B (en) 2020-07-28 2020-07-28 Hydraulic system and vehicle

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Publication Number Publication Date
CN111980995A CN111980995A (en) 2020-11-24
CN111980995B true CN111980995B (en) 2022-11-18

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Application Number Title Priority Date Filing Date
CN202010737999.3A Active CN111980995B (en) 2020-07-28 2020-07-28 Hydraulic system and vehicle

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Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN208885929U (en) * 2018-08-29 2019-05-21 长城汽车股份有限公司 Double clutch automatic speed changing case hydraulic control system and vehicle

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CN111980995A (en) 2020-11-24

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